I’m not one to advertise a third party unless I think it’s a valuable service for you, so this is one worth a look in my opinion. bla.st (link removed on 11 October 2012 as the site seems to have disappeared) is an online business card gallery to promote your business.
Chris gave a good description of it on Blog-Op (link removed — another disappearance).
The sooner you upload your card for free, the higher in the rankings you’ll be. You can pay to be at the very top, but at the time of writing, free uploads are on the first page of relevant results.
My card’s simple, just my logo on a white background. I uploaded it for free about an hour ago and have noticed a few visits already.
It only took about five minutes, so it might be worth a shot yourself.